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Despite campfire fears dating back to at least 1967, black bears and grizzly bears are not attracted to the odors of menstruation, according to a recent Yellowstone National Park report.

Polar bears may be interested in the smell of menstrual blood, the report found, but bears that roam in North America are not. Food is a much more important temptation for bears, according to the findings.

They also add

[According to a Yellowstone Park Report] the report concludes, there is no evidence of a link between bear attacks and menstruation. Nevertheless, the Park Service recommends using tampons instead of external pads and unscented menstrual products to keep potentially appealing odors down.